CN204928957U

CN204928957U - A circuit that is used for beautiful mark earphone automated inspection of smart mobile phone eu standard

Info

Publication number: CN204928957U
Application number: CN201520740527.8U
Authority: CN
Inventors: 闫亚婧
Original assignee: Shanghai Chinapalms Communication Technology Co Ltd
Current assignee: Shanghai lucky Communication Technology Co., Ltd.
Priority date: 2015-09-23
Filing date: 2015-09-23
Publication date: 2015-12-30
Anticipated expiration: 2025-09-23

Abstract

The utility model discloses a circuit that is used for beautiful mark earphone automated inspection of smart mobile phone eu standard, earphone socket divide into four contacts from inside to outside, are called first contact, second contact, third contact and fourth contact respectively, the circuit includes single -pole double -throw, its characterized in that the normal close of normally opening end and second switch of earphone socket's fourth contact and the first switch of single -pole double -throw is held and is connected, earphone socket's third contact and the first switch normal close of the single -pole double -throw end and the end of normally opening of second switch are connected, the sense terminal of the stiff end connection control circuit of the first switch of single -pole double -throw, and simultaneously through a pull -up resistance power connection, the stiff end ground connection of single -pole double -throw second switch, single -pole double -throw's control termination control circuit's control signal terminal. The utility model discloses make same portion smart mobile phone can be suitable for beautiful mark, two kinds of differences of eu standard, 3.5 standard earphones simultaneously to can carry out the self -adaptation after the earphone inserts switches normal use.

Description

A kind of circuit automatically detected for smart mobile phone Europe superscript American Standard earphone

Technical field

The utility model is a kind of technology inserting identification automatically for smart mobile phone earphone, is specially a kind of circuit automatically detected for smart mobile phone Europe superscript American Standard earphone, and earphone automatically identifies Europe superscript earphone or American Standard earphone after inserting smart mobile phone.

Background technology

At present earphone interface of mobile phone standard general in the world has two, and one is the standard of OMTP, and one is the standard of CTIA.In general, international manufacturer major part uses CTIA standard, and as the iPhone earphone of the U.S., Hong Kong and other international markets, domestic crudely-made articles product then needs to support OMTP standard.

American Standard earphone four pole connection: several each section of definition from foremost: L channel/R channel/ground wire/mike system.Europe superscript earphone four pole connection: several each section of definition from foremost: L channel/R channel/mike system/ground wire.Their differences are that ground wire and mike system (MIC) two contact points exchange before and after having carried out.Therefore the design is conceived to earphone and inserts the judgement identification detected and to last two segment signals after insertion.

Traditional earphone detecting process (for Europe superscript earphone) is generally as follows: HEAD_DET signal hangs over some interruption pin (low interruption is effective) of mobile phone base band chip BB, high level is connect by pull-up resistor R in BB outside, vacant state is at earphone base end, therefore when earphone does not insert, HEAD_DET signal is pulled upward to high level, because the distinctive structural design of earphone base makes HEAD_DET signal and headset left channel short circuit after earphone inserts, and in fact L channel is equivalent to 32 resistance windings to earphone GND at earphone end, now earphone GND(the 4th section) receive on control circuit GND, this is just equivalent to HEAD_DET signal one end and receives high level by resistance R, the other end is equivalent to 32 Ohmic resistance connection control circuit GND.R is hundreds of K Ohmic resistance normally, and 32 ohm is the equal of a strong pull-down resistance by contrast, and therefore HEAD_DET signal is now low level, and BB end interruption pin receives low level signal and judges now have earphone to insert.

Summary of the invention

The utility model can only use the situation of non-Europe superscript and American Standard earphone for a mobile phone, propose a kind of circuit automatically detected for smart mobile phone Europe superscript American Standard earphone, object is that same portion smart mobile phone can be suitable for American Standard, Europe superscript two kinds of various criterion 3.5 earphones simultaneously, and can self adaptation switching be carried out after earphone inserts, normally use.

To achieve these goals, the technical solution of the utility model is as follows: a kind of circuit automatically detected for smart mobile phone Europe superscript American Standard earphone, receiver J-Horner is divided into four contacts from inside to outside, be called the first contact, second contact, 3rd contact and the 4th contact, described circuit comprises single-pole double-throw switch (SPDT), it is characterized in that the 4th contact of described receiver J-Horner is connected with the Chang Kaiduan of single-pole double-throw switch (SPDT) first switch and the normal-closed end of second switch, 3rd contact of receiver J-Horner is connected with the Chang Kaiduan of second switch with single-pole double-throw switch (SPDT) first switch normal-closed end, the test side of the stiff end connection control circuit of single-pole double-throw switch (SPDT) first switch, and connect power supply by a pull-up resistor simultaneously, the stiff end ground connection of single-pole double-throw switch (SPDT) second switch, the control signal end of the control end connection control circuit of single-pole double-throw switch (SPDT).

According to preferred embodiment of the present utility model, described circuit also comprises a comparator, first contact of receiver J-Horner is connected with the first input end of described comparator, and the second input of described comparator connects reference voltage, the trigger end of the output connection control circuit of described comparator.

The utility model utilizes a single-pole double-throw switch (SPDT) to switch MIC and GND circuit, earphone normally to be used.At the beginning, 4th contact ground of receiver J-Horner, the 3rd contact of receiver J-Horner connects test side, and namely acquiescence connects Europe superscript earphone, control circuit test side detects normal voltage value, then judge that access earphone is Europe superscript earphone, on off state is constant, and Europe superscript earphone maintains normal work, if control circuit test side detects that magnitude of voltage is too low, then judge that access earphone is American Standard earphone, and diverter switch, make American Standard earphone be able to normal work.The utility model has the advantage of and make same portion smart mobile phone can be suitable for American Standard, Europe superscript two kinds of various criterion 3.5 earphones simultaneously, and can self adaptation switching be carried out after earphone inserts, normally use.

Accompanying drawing explanation

Fig. 1 is circuit diagram of the present utility model.

Fig. 2 is the winding diagram of comparator.

Fig. 3 is single-pole double-throw switch (SPDT) circuit diagram.

Embodiment.

Fig. 1 is circuit diagram of the present utility model.A kind of circuit automatically detected for smart mobile phone Europe superscript American Standard earphone, receiver J-Horner J1 is divided into four contacts from inside to outside, be called the first contact 1, second contact 2, 3rd contact 3 and the 4th contact 4, described circuit comprises single-pole double-throw switch (SPDT) 5, it is characterized in that the 4th contact 4 of described receiver J-Horner is connected with the Chang Kaiduan of single-pole double-throw switch (SPDT) first switch and the normal-closed end of second switch, 3rd contact 3 of receiver J-Horner is connected with the Chang Kaiduan of second switch with single-pole double-throw switch (SPDT) first switch normal-closed end, the test side of the stiff end connection control circuit 7 of single-pole double-throw switch (SPDT) first switch, and connect power supply by a pull-up resistor simultaneously, the stiff end ground connection of single-pole double-throw switch (SPDT) second switch, the control end connection control circuit 7 control signal end of single-pole double-throw switch (SPDT) 5.Described circuit also comprises a comparator 6, and the first contact 1 of receiver J-Horner is connected with the first input end of described comparator 6, and the second input of described comparator 6 connects reference voltage, the trigger end of the output connection control circuit 7 of described comparator 6.

Single-pole double-throw switch (SPDT) enables earphone normally use for switching MIC and GND circuit.

Add comparator object as follows: if insertion is American Standard earphone, due to no longer same with the control circuit GND electromotive force of earphone GND, and the electrical potential difference be equivalent to adding an earphone to MIC impedance on control circuit GND zero potential basis, and then the voltage output value that whole circuit loop dividing potential drop obtains HEAD_DET signal is about 0.8-1.5V (different earphone MIC impedance is different, mostly at 1K-3.5K).If directly the trigger end INT pin of this magnitude of voltage input control circuit is had problem.Because the CMOS input requirements logic high of main flow baseband chip is higher than 0.7*VCC at present, logic low is lower than 0.3*VCC, and VCC adopts 2.8V to power mostly, so logic high is higher than 1.96V, logic low is lower than 0.84V, and HEAD_DET signal voltage (about 0.8-1.5V) now seems not to be an effective logic level.Solution utilizes a voltage comparator exactly, HEAD_DET is received input, when voltage compare result is greater than the voltage reference point just input logic high higher than 1.96V of comparator, when comparative result is lower than a voltage reference point just input logic low lower than 0.84V, after this addresses the problem the insertion of American Standard earphone, HEAD_DET signal is difficult to the problem detected.

The choosing of single-pole double-throw switch (SPDT) and comparator should be taken into account the advantages such as low noise, high reliability, low-power consumption, volume be little so that use in high density, space is little, power consumption requirements is high cell phone system.

Performing step: first, control single-pole double-throw switch (SPDT) and earphone base the 3rd section is connected MIC circuit, the 4th section of connection control circuit GND, is intended to first suppose an Europe superscript pattern.If what insert is Europe superscript earphone, be low level according to analyzing HEAD_DET signal above, output low level signal is compared to control circuit through comparator, now control circuit is had no progeny in receiving unlatching detection process: when ADC pin detects that MIC circuit level is that normal set point then regards as Europe superscript earphone, at this moment on off state remains unchanged, and earphone can normally use.If insert be American Standard earphone, through comparator relatively after result output low level, interrupt routine open detecting: the magnitude of voltage that ADC pin detects can lower than normal set point.When ADC detects brownout, then diverter switch, makes earphone base the 3rd section connect GND, and connect MIC circuit for the 4th section, rise if ADC detection node 1 voltage potential has and stablize one end time, then what insert is exactly American Standard earphone, and switch retains current state.

As shown in Figure 2,3, single-pole double-throw switch (SPDT) NLAS5223L, supply power voltage 1.65-3.0V, interface level is 1.8V to circuit diagram, and the GPIO power domain meeting main flow baseband chip is at present chosen.This device power consumption is low, maximum static current 1UA, and switch conduction resistance is little, and switch OFF is leakage current is about 10NA, size 1.4*1.8mm.Voltage comparator U2 chooses MAX9060, supply power voltage 0.9-5.5V, input voltage 0-5.5V, output LOW voltage 0.2-0.5V, and output PIN is OPENDRAIN, operating current in microampere rank, size 1*1mm.The output COM1 connection control circuit MIC circuit of single-pole double-throw switch (SPDT), COM2 connection control circuit GND, two GPIO1/GPIO2 of the logic control end IN1/IN2 difference connection control circuit of switch.NO1/NC1 is that/normally closed interlock often left by switch 1, and NO2/NC2 is that/normally closed interlock often left by switch 2, and earphone base the 3rd section receives NO1 and NC2, and earphone base the 4th section receives NO2 and NC1.Mobile phone powers on after opening initialization and GPIO1/2 is set to logical one/1, and namely earphone base the 3rd section receives MIC circuit, receives GND for the 4th section.After American Standard earphone inserts, HEAD_DET voltage is between 0.8-1.5V, and after entering comparator Q1, output logic low level is to the interruption pin of mainboard, is now determined with earphone and inserts.Enter detection process: when ADC detects the brownout of node 1, then GPIO1/2 is set to logical zero/0, diverter switch, earphone base the 3rd section is made to connect GND, connect MIC circuit for 4th section, rise if ADC detection node 1 voltage potential has and stablize one end time, then what insert is exactly American Standard earphone, and switch retains current state.

Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that the utility model is specifically implemented to be confined to these explanations above-mentioned.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection range of the present utility model.

Claims

1. the circuit automatically detected for smart mobile phone Europe superscript American Standard earphone, receiver J-Horner is divided into four contacts from inside to outside, be called the first contact, second contact, 3rd contact and the 4th contact, described circuit comprises single-pole double-throw switch (SPDT), it is characterized in that the 4th contact of described receiver J-Horner is connected with the Chang Kaiduan of single-pole double-throw switch (SPDT) first switch and the normal-closed end of second switch, 3rd contact of receiver J-Horner is connected with the Chang Kaiduan of second switch with single-pole double-throw switch (SPDT) first switch normal-closed end, the test side of the stiff end connection control circuit of single-pole double-throw switch (SPDT) first switch, and connect power supply by a pull-up resistor simultaneously, the stiff end ground connection of single-pole double-throw switch (SPDT) second switch, the control signal end of the control end connection control circuit of single-pole double-throw switch (SPDT).

2. circuit as claimed in claim 1, it is characterized in that, described circuit also comprises a comparator, and the first contact of receiver J-Horner is connected with the first input end of described comparator, second input of described comparator connects reference voltage, the trigger end of the output connection control circuit of described comparator.